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The crossover, which occurred mainly through the monthly Superman titles, Wonder Woman, and a series of character themed one-shot specials, dealt with the heroes of the DC Universe facing the threat of the cosmic force known as Imperiex, who attacked Earth for the purpose of using the planet as the staging ground for the "hollowing" of the entire universe.

Thanks to the sacrifice of Strange Visitor and General Rock, Earth's forces managed to crack Imperiex's armor, intending that Darkseid would subsequently use Boom tube technology to transfer Imperiex's energy back to the galaxies that he had destroyed. However, Brainiac-13 appeared on the battleground with Warworld, and absorbed the Imperiex energies, vowing to use them to rule everything.

In a desperate gambit, Superman dived into the heart of the sun, thus gaining a massive power boost that enhanced his abilities significantly. Rapidly realizing that Warworld couldn't be destroyed without releasing Imperiex and triggering another Big Bang, Superman and the Martian Manhunter formed a brief telepathic link with the remaining major combatants — including Darkseid, Lex Luthor, Steel and Wonder Woman — to explain their new plan. With Darkseid's powers weakened, they would have to use Tempest, empowered by the faith and strength of the Amazons, focusing the energy through Steel's new 'Entropy Aegis' armor (which was created from a burned-out Imperiex probe), and, with Lex Luthor activating a temporal displacement weapon, Superman would subsequently push Warworld through a temporal boom tube, sending both Imperiex Prime's and Brainiac's consciousness back 14 billion years to the Big Bang, destroying both villains through a combined effort. In his final moments, Imperiex Prime realized, in an ironic twist, that the imperfection he had detected in the universe was himself.

The planet Daxam was involved, temporarily stolen from its rightful orbit.

"Our Worlds At War" came to a close just weeks before the attacks of September 11, 2001. Adventures of Superman #596 was released one day after the attack, featuring the image of Lex Luthor's twin LexTowers heavily damaged by alien attacks on the issue's second page. The book's writer, Joe Casey, could not have intentionally referenced the attacks on the World Trade Center, as the story was written well before September. DC acknowledged that it mirrored the devastation so vividly that they made the books returnable without penalty to retailers.[1]

Superman/Batman #64, #68-#71 (A brief new direction of the Superman/Batman series at the start of 2010 featured a story that took place in the aftermath of Our Worlds at War with #64 acting as a prologue and #68 through #71 being the story proper complete with the trade dress banner.)